header{
    height: 100px;
    background: rgb(124, 128, 187);
    display:flex;
}

.vue{
    width: 200px;
    height: 200px;
    float: left;
    margin-right: 20px;
    background: url('../images/vue.png');
    background-size: cover;
}

.react{
    width: 200px;
    height: 200px;
    float: left;
    margin-right: 20px;
    background: url('../images/react.png');
    background-size: cover;
}